Spring/spring-test-data-geode
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Add isEmpty(:File) method to determine whether a file or a directory is empty.

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A file is empty if the file size (length) is 0 bytes.  A directory is empty if it contains no files.
This commit is contained in:
John Blum
2020-06-17 15:03:38 -07:00
parent 140b423f70
commit a4e6892a55
1 changed files with 30 additions and 9 deletions
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39
spring-data-geode-test/src/main/java/org/springframework/data/gemfire/tests/util/FileSystemUtils.java
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@@ -24,6 +24,9 @@ import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import org.springframework.data.gemfire.util.ArrayUtils;
import org.springframework.lang.NonNull;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
/**
@@ -65,12 +68,12 @@ public abstract class FileSystemUtils extends FileUtils {
return ((!exists(path) || path.delete()) && success);
}
public static boolean exists(File path) {
public static boolean exists(@Nullable File path) {
return path != null && path.exists();
}
// returns sub-directory just below working directory
public static File getRootRelativeToWorkingDirectoryOrPath(File path) {
public static @Nullable File getRootRelativeToWorkingDirectoryOrPath(@Nullable File path) {
File localPath = path;
@@ -80,10 +83,19 @@ public abstract class FileSystemUtils extends FileUtils {
}
}
return (localPath != null ? localPath : path);
return localPath != null
? localPath
: path;
}
public static File[] listFiles(File directory, FileFilter fileFilter) {
public static boolean isEmpty(File path) {
return isDirectory(path)
? ArrayUtils.isEmpty(path.listFiles())
: nullSafeLength(path) == 0;
}
public static @NonNull File[] listFiles(@NonNull File directory, @NonNull FileFilter fileFilter) {
Assert.isTrue(isDirectory(directory),
String.format("File [%s] does not refer to a valid directory", directory));
@@ -102,14 +114,23 @@ public abstract class FileSystemUtils extends FileUtils {
return results.toArray(new File[0]);
}
public static File[] safeListFiles(File directory) {
public static @NonNull File[] safeListFiles(@Nullable File directory) {
return safeListFiles(directory, AllFilesFilter.INSTANCE);
}
public static File[] safeListFiles(File directory, FileFilter fileFilter) {
FileFilter resolvedFileFilter = (fileFilter != null ? fileFilter : AllFilesFilter.INSTANCE);
File[] files = (isDirectory(directory) ? directory.listFiles(resolvedFileFilter) : null);
return (files != null ? files : NO_FILES);
public static @NonNull File[] safeListFiles(@Nullable File directory, @Nullable FileFilter fileFilter) {
FileFilter resolvedFileFilter = fileFilter != null
? fileFilter
: AllFilesFilter.INSTANCE;
File[] files = isDirectory(directory)
? directory.listFiles(resolvedFileFilter)
: null;
return files != null
? files
: NO_FILES;
}
public static class AllFilesFilter implements FileFilter {